I recently bought a used 2011 Mule 4010 Trans 4x4 with about 600 hours on it. It runs great except that in high, it feels like it loses power momentarily, then "surges" (gets power back)... It's like it's hitting the governor maybe. It does this at full speed, but also if I back off the accelerator just a little, it still does it. It doesn't seem to do this when I'm going up or down hill, just when ridding on a level surface, and it does NOT do this at all in low.

This mule has been lifted 2 inches & has 26 inch tires ... Not sure if related, but thought I'd mention it.

Any thoughts or suggestions?